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Mist Valley Avatar WIND/Thunder-Type Effect Monster/Level 6/1900 ATK/2800 DEF Lore: (Quick Effect): You can reveal this card from your hand, then target 1 Level 3, 5, or 7 WIND monster on the field

With other complementary artifact mana sources like Thran Dynamo and Grim Monolith, decks could count on being able to get the kind of mana you'd need to justify packing the cards that would let you use the mana from Metalworker to deliver the knockout blow, and their presence lets you turn that Metalworker mana into permanent giant amounts of mana rather than just a one shot deal

While many card sleeves offer the same protective qualities, there are some better suited for different things